{"id":"USN-8282-2","summary":"unbound vulnerabilities","details":"USN-8282-1 fixed vulnerabilities in Unbound. This update provides the\ncorresponding updates for CVE-2026-41292 in Ubuntu 18.04 LTS and Ubuntu\n20.04 LTS and CVE-2026-42959, CVE-2026-42960 in Ubuntu 14.04 LTS, Ubuntu\n16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.\n\nOriginal advisory details:\n\n Andrew Griffiths discovered that Unbound did not properly handle certain\n DNSCrypt packets. A remote attacker could possibly use this issue to cause\n Unbound to crash, resulting in a denial of service. (CVE-2026-32792)\n\n Qifan Zhang discovered that Unbound incorrectly handled DNSSEC validation\n in certain situations. A remote attacker could possibly use this issue to\n execute arbitrary code. This issue only affected Ubuntu 24.04 LTS,  Ubuntu\n 25.10, and Ubuntu 26.04 LTS. (CVE-2026-33278)\n\n Qifan Zhang discovered that Unbound incorrectly handled certain ghost\n domain name records. A remote attacker could possibly use this issue to\n cause a denial of service. This issue only affected Ubuntu 24.04 LTS,\n Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-40622)\n\n Qifan Zhang discovered that Unbound did not properly limit processing of\n long EDNS option lists. A remote attacker could possibly use this issue to\n cause Unbound to use excessive resources, leading to a denial of service.\n (CVE-2026-41292)\n\n Qifan Zhang discovered that Unbound incorrectly handled jostle logic under\n certain circumstances. A remote attacker could possibly use this issue to\n cause Unbound to use excessive resources, leading to a denial of service.\n (CVE-2026-42534)\n\n Qifan Zhang discovered that Unbound did not properly bound NSEC3 hash\n calculations. A remote attacker could possibly use this issue to cause\n Unbound to use excessive resources, leading to a denial of service.\n (CVE-2026-42923)\n\n Qifan Zhang discovered that Unbound incorrectly handled multiple EDNS\n options in certain situations. A remote attacker could possibly use this\n issue to cause Unbound to crash, resulting in a denial of service, or\n execute arbitrary code. This issue only affected Ubuntu 24.04 LTS,  Ubuntu\n 25.10, and Ubuntu 26.04 LTS. (CVE-2026-42944)\n\n Qifan Zhang discovered that Unbound incorrectly handled DNSSEC validation\n of malicious content. A remote attacker could possibly use this issue to\n cause Unbound to crash, resulting in a denial of service.\n (CVE-2026-42959)\n\n TaoFei Guo, Yang Luo, and JianJun Chen discovered that Unbound\n incorrectly handled delegation processing in certain situations. A remote\n attacker could possibly use this issue to poison the DNS cache and obtain\n sensitive information. (CVE-2026-42960)\n\n Qifan Zhang discovered that Unbound did not properly bound name\n compression in certain cases. A remote attacker could possibly use this\n issue to cause Unbound to use excessive resources, leading to a denial of\n service. (CVE-2026-44390)\n\n Qifan Zhang discovered that Unbound had a use-after-free issue in RPZ\n handling. A remote attacker could possibly use this issue to cause Unbound\n to crash, resulting in a denial of service, or execute arbitrary code.\n This issue only affected Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04\n LTS. (CVE-2026-44608)","modified":"2026-06-02T22:33:06.184447693Z","published":"2026-06-02T18:26:07Z","related":["UBUNTU-CVE-2026-41292","UBUNTU-CVE-2026-42959","UBUNTU-CVE-2026-42960"],"upstream":["CVE-2026-41292","CVE-2026-42959","CVE-2026-42960","UBUNTU-CVE-2026-41292","UBUNTU-CVE-2026-42959","UBUNTU-CVE-2026-42960"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8282-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-41292"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42959"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-42960"}],"affected":[{"package":{"name":"unbound","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.4.22-1ubuntu4.14.04.3+esm3"}]}],"versions":["1.4.20-1","1.4.21-1","1.4.21-1ubuntu1","1.4.21-1ubuntu2","1.4.22-1ubuntu1","1.4.22-1ubuntu2","1.4.22-1ubuntu3","1.4.22-1ubuntu4","1.4.22-1ubuntu4.14.04.1","1.4.22-1ubuntu4.14.04.2","1.4.22-1ubuntu4.14.04.3","1.4.22-1ubuntu4.14.04.3+esm1","1.4.22-1ubuntu4.14.04.3+esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"libunbound2","binary_version":"1.4.22-1ubuntu4.14.04.3+esm3"},{"binary_name":"python-unbound","binary_version":"1.4.22-1ubuntu4.14.04.3+esm3"},{"binary_name":"unbound","binary_version":"1.4.22-1ubuntu4.14.04.3+esm3"},{"binary_name":"unbound-anchor","binary_version":"1.4.22-1ubuntu4.14.04.3+esm3"},{"binary_name":"unbound-host","binary_version":"1.4.22-1ubuntu4.14.04.3+esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8282-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Red","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-42959"},{"severity":[{"score":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/U:Amber","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-42960"}]}}},{"package":{"name":"unbound","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.8-1ubuntu1.1+esm3"}]}],"versions":["1.4.22-1ubuntu6","1.5.7-1ubuntu1","1.5.7-1ubuntu2","1.5.8-1ubuntu1","1.5.8-1ubuntu1.1","1.5.8-1ubuntu1.1+esm1","1.5.8-1ubuntu1.1+esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"libunbound2","binary_version":"1.5.8-1ubuntu1.1+esm3"},{"binary_name":"python-unbound","binary_version":"1.5.8-1ubuntu1.1+esm3"},{"binary_name":"unbound","binary_version":"1.5.8-1ubuntu1.1+esm3"},{"binary_name":"unbound-anchor","binary_version":"1.5.8-1ubuntu1.1+esm3"},{"binary_name":"unbound-host","binary_version":"1.5.8-1ubuntu1.1+esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8282-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Red","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-42959"},{"severity":[{"score":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/U:Amber","type":"CVSS_V4"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-42960"}]}}},{"package":{"name":"unbound","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.7-1ubuntu2.6+esm4"}]}],"versions":["1.6.5-1","1.6.7-1","1.6.7-1build1","1.6.7-1ubuntu1","1.6.7-1ubuntu2","1.6.7-1ubuntu2.1","1.6.7-1ubuntu2.2","1.6.7-1ubuntu2.3","1.6.7-1ubuntu2.4","1.6.7-1ubuntu2.5","1.6.7-1ubuntu2.6","1.6.7-1ubuntu2.6+esm2","1.6.7-1ubuntu2.6+esm3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"libunbound2","binary_version":"1.6.7-1ubuntu2.6+esm4"},{"binary_name":"python-unbound","binary_version":"1.6.7-1ubuntu2.6+esm4"},{"binary_name":"python3-unbound","binary_version":"1.6.7-1ubuntu2.6+esm4"},{"binary_name":"unbound","binary_version":"1.6.7-1ubuntu2.6+esm4"},{"binary_name":"unbound-anchor","binary_version":"1.6.7-1ubuntu2.6+esm4"},{"binary_name":"unbound-host","binary_version":"1.6.7-1ubuntu2.6+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8282-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Red","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-41292"},{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Red","type":"CVSS_V4"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-42959"},{"severity":[{"score":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/U:Amber","type":"CVSS_V4"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-42960"}]}}},{"package":{"name":"unbound","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/unbound?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.4-2ubuntu1.11+esm1"}]}],"versions":["1.9.0-2ubuntu1","1.9.0-2ubuntu2","1.9.4-2","1.9.4-2ubuntu1","1.9.4-2ubuntu1.1","1.9.4-2ubuntu1.2","1.9.4-2ubuntu1.3","1.9.4-2ubuntu1.4","1.9.4-2ubuntu1.5","1.9.4-2ubuntu1.6","1.9.4-2ubuntu1.8","1.9.4-2ubuntu1.9","1.9.4-2ubuntu1.11"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"libunbound8","binary_version":"1.9.4-2ubuntu1.11+esm1"},{"binary_name":"python-unbound","binary_version":"1.9.4-2ubuntu1.11+esm1"},{"binary_name":"python3-unbound","binary_version":"1.9.4-2ubuntu1.11+esm1"},{"binary_name":"unbound","binary_version":"1.9.4-2ubuntu1.11+esm1"},{"binary_name":"unbound-anchor","binary_version":"1.9.4-2ubuntu1.11+esm1"},{"binary_name":"unbound-host","binary_version":"1.9.4-2ubuntu1.11+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8282-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Red","type":"CVSS_V4"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-41292"},{"severity":[{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Red","type":"CVSS_V4"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-42959"},{"severity":[{"score":"CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:H/E:P/U:Amber","type":"CVSS_V4"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-42960"}]}}}],"schema_version":"1.7.5"}